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Eaton
MES3800LSG
Interchangeable Trip Unit


Eaton MES3800LSG Thermal-Magnetic Circuit Breakers with Interchangeable Trip Units Series-C
Frame Size - M
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Type MT Shown

MES3800LSG Interchangeable Trip Unit

Number
of Poles
Amperes Interrupting
Capacity
Type
of Trip
Terminals
3 Digitrip RMS 310
Trip Unit +
LSG
Thermal-Magnetic Standard

Digitrip RMS 310 Trip Unit KEY:
L – Adjustable Long Delay Pickup (By Adjustable Rating Plug)
S – Adjustable Short Delay Pickup with Fixed Short Delay Time (I2t Response) or Adjustable Short Delay Time (Flat Response)
I – Adjustable Instantaneous Pickup by Setting Short Delay Time to Instantaneous
G – Adjustable Ground Fault Pickup with Adjustable Ground Fault Delay (Flat Response)

Quick Reference Guide

UL 489/CSA Interrupting Capacity Ratings(1)
Circuit
Breaker
Type
Number
of Poles
Interrupting Capacity (kA Symmetrical Amperes)
Volts AC (50/60 Hz) Volts DC(2)(3)
240 480 600 250
MDL, MDLB 2, 3 65 50 25 22
CMDL   2, 3 65 50 25
HMDL, HMDLB 2, 3 100 65 35 25
CHMDL     2, 3 100 65 35
IEC 947-2 Interrupting Capacity Ratings 1
Circuit
Breaker
Type
Number
of Poles
Interrupting Capacity rms (kA Symmetrical Amperes) ICU ≠ ICS
Volts AC (50/60 Hz) Volts DC(2)(3)
240 415 690 250
MDL, MDLB 2, 3 65/65 50/50 20/10 20/10
CMDL 2, 3 65/65 50/50 20/10
HMDL, HMDLB  2, 3 100/100 70/50  25/13 20/10
CHMDL 2, 3 100/100 70/50 25/13

NOTES:
(1) Utilization Category A circuit breakers.
(2) Two-pole or two poles of three-pole circuit breaker. Thermal-magnetic trip units only, MDL, HMDL breakers with electronic trip unit are not DC rated.
(3) Time constant is 3 milliseconds minimum at 10 kA and 8 milliseconds at 22 kA.

Specifications

Trip Unit Type Digitrip RMS 310
rms sensing Yes Yes
Breaker Type
Frame  MDL, MDLB, CMDL, HMDL, HMDLB, CHMDL MDL, MDLB, CMDL, HMDL, HMDLB, CHMDL
Ampere range 400–800A 400–800A
Interrupting rating
at 480 volts
50, 65 (kA) 50, 65 (kA)
Protection
Ordering options LS, LSG LSI, LSIG
Fixed
rated plug (In)
Yes Yes
Overtemperature trip Yes Yes
Long Delay Protection (L)
Adjustable
rating plug (In)
Yes Yes
Long delay pickup 0.5–1.0 (In)(1) 0.5–1.0 (In)(1)
Long delay time I2t 12 seconds 12 seconds
Long delay time I4t No No
Long delay
thermal memory
Yes Yes
High load alarm No No
Short Delay Protection (S)
Short delay pickup 200–800% x (In) 200–800% x (In)
Short delay time I2t 100 ms No
Short delay time flat No Inst–300 ms
Short delay
time zone selective interlocking 
No No
Instantaneous Protection (I)
Instantaneous pickup  No 200–800% x (In)
Discriminator No No
Instantaneous override  Yes Yes
Ground Fault Protection (G)
Ground fault alarm  No No
Ground fault pickup 1–5 x Ig (160A) 1–5 x Ig (160A)
Ground fault delay I2t No No
Ground fault delay flat  Inst–500 ms Inst–500 ms
Ground fault
zone selective
interlocking 
No No
Ground fault
thermal memory
Yes Yes
System Diagnostics
Status LEDs Yes Yes
Cause of trip LEDs No No
Magnitude of trip information No No
Remote
signal contacts—ground alarm 
Yes(2) Yes(2)
System Monitoring
Digital display No No
Current  No No
Power and energy No No
Power quality—
harmonics
No  No
Power factor  No No
Communications
Eaton’s PowerNet No No
Testing
Testing method  Test set Test set
Legend
In = Rating Plug
Notes
(1) Adjust by rating plug.
(2) With separate ground fault alarm unit (GFAU).

MES3800LSG Dimensions

Eaton MES3800LSG Dimensions
Number of Poles Width Height Depth
2, 3 8.25 (209.6) 16.00 (406.4) 4.06 (103.1)



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